Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbf0ef120748329…

MALICIOUS

PDF

76.9 KB Created: 2021-05-06 10:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 54bf584e12ef1548c930763952f698fc SHA-1: eb0606894c91855029f0ea437bcb8f14bff3a07d SHA-256: 5dbf0ef120748329af61f6048132d7692ccb3d2e2f65d3b3928c445715985920
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to fishing tackle, which is likely a pretext to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=fishing+tackle+for+saltwater+pier+fishing PDF link annotation
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/8077072.pdfIn PDF document text
    • https://voradirara.weebly.com/uploads/1/3/4/7/134744625/59f27fdad89abe.pdfIn PDF document text
    • https://kevewejisarugi.weebly.com/uploads/1/3/4/6/134611403/661252.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/bhagavad_gita_libro.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/4336451.pdfIn PDF document text
    • http://ses-paypal.com/iphone_5s_icloud_bypass_tool_freegh933.pdfIn PDF document text
    • http://christmas-gift.ru/42445365878796vk.pdfIn PDF document text
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/posizarojirirebovez.pdfIn PDF document text
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/nijopebefexokej_vujaru_gigenuk.pdfIn PDF document text
    • https://wemupubipu.weebly.com/uploads/1/3/5/3/135331653/1132235.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/mesiv.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/business_loan_agreement_form.pdfIn PDF document text
    • http://fly-drive.online/basic_calculus_functionshs0db.pdfIn PDF document text
    • https://diwoneguni.weebly.com/uploads/1/3/1/4/131407083/ropobadajite.pdfIn PDF document text
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/davanewimiwir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf998a1-1bb2-4728-9e25-f9d12fb20510/how_to_service_a_grandfather_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad96b72-458b-4c52-9628-3a43d464816e/72942915602.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 5388 bytes
SHA-256: b98fe524a315709943a8f99bec9cded0611012babdb41fc8fa0fc86110367525
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10320 bytes
SHA-256: 74770ae6787be70ce6d4bf69f176c3f798f0d3e771fab5692706d3933ecac41f

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